Pressure-retaining valve



Dec. 16, 1924- 1,519,190

E. L.. CLARK PRESSURE?. RETf. I NI NG VALVE Original Filed March f1, 1.922

Patented Dec. 16, 1924.

PATENT OFFICE.

EDDY L. CLARK, 0F WEST PITTSTON, PENNSYLVANIA.

PRESSURE-RETAINING VALVE.

AppIeation filed March 4, `1922, Serial No. 541,082.

To fallwwm #may concern:

Be it known thatl, EDDYL. Chiama citi--v zen of the United States, 4and resident .of West Pittston, `in thecounty ofvLuzerne and State of Pennsylvania, `have invented certain new and useful Improvements in'Pressure-Retaining Valves, of l-whichv the following is a specification.

This. invention .relates to pressure retaining valves, .and .particularly valves of .the kind used Vin connection with the air brake systems of railroad cars.

The objectof my invention is to provide a .pressure retaining valve of `Vsimple and efficient construction having a valve element that can be readily mounted within thle valve `case and adjusted to .resist .any rey quired pressure from the brake cylinder; suoli a valve thatwill eii'ectuallyinaintain its seat under the varying conditions of service, andsuch a valve/wherein the ele-. ments are .readily removable. and replaceable as-occasion may require.

lViththese and other objects in view my invention comprises various novel features of construction and combinations of parts which will be hereinafter described and claimed.

In the drawings:

VVFigure 1 isa vertical section of avalve deviceembodying one form ofmy invention.

Fig. 2 is a. similar. sectionat .right angles to Fig. 1, the valve elementfbeingshown in elevation.

A-Figx is axtransverse section. of the device, as on the line 3-3 of Fig. 12,' showinga supporting bar therefor. y

Fig. L1 isl a vertical section, on ya smaller scale, of apmodified form of valve element.

Referring to the drawings, 10 designates a body having a central port11 provided` intermediate its ends with a llateral exhaust port 12. The lower end of they body is adaptedtobe coupled, as usual, to the train ipe extending rfrom the brake cylinder. Fittedto the upper endof the body -is a valve case 13 such end constituting the bottom of the valve chamber `and having a suitablydisposed vent port'li. Rotatably fitted withinthe body is a transverse cock leyjlfmanually. operable to establish communication between the trainpipe and the exhaustport 12, orbetween the train vpipe Renewed October 24, 1924.

and'. the vented chamber of the valve case, as desired. Xllithin this chamber is mounted the valve element which .normally closes communication between the said chamber and the port 11, but is adapted to be automatically raised to open position by a predetermined pressure in the brake cylinder.

According to the preferred form of my invention, the valve element comprises a cylindrical support compose-d of two members 16 placed face to face and in axial alinement with each other,.and so connected that they can be nicely adjusted within limits toward and from each other. In the present instance the adjustable connection between the membersvis attained by providing one of the members with a threaded male portion 17 and the other member with a tapped yfemale portion 18 to receive theportion 17, the rlatter membervhaving a radial set-screw 19 whereby when the members are adj usted by their relative rotation they can be tightly secured in the .position of adjustment. On the outer faces of thermembers 16 are secured the-flat surfaces of two plano-convex bodies 20, 21, respectively, of elastic substance, such, for example, as rubber. The flat surfaces of the two bodies are preferably firmly yet detachably secured to the respective members, and torthat `end I provide `such surfaces with tapering or dove-tailed projections 22 which :can be readily fitted into and interlockedwith correspondingly tapering sockets 28-in lthe respective members.

The pressure valve element `thus con structed is .so disposed with-in the. valve chamber that one of the bodies,as 20, rests on a concave valve seat 2st at the bottom of the chamber, and the other body, as 21, bears yieldingly against a concave bearing surface 25 at the top of the chamber in such amanner as to press the valve element bode ily downward and hold the lower member positively down to its seat in opposition to the upward pressure from the brake cylinder.

Preferably the bearing surface 25 is formed on a head 26 which is vertically adjustable within the upper portion ofthe chamber in a manner to exert more orless pressure on the opposing body as desired. This head is provided with an upstanding threaded shank 27 which is adjustably fitted to a threaded orifice 28 in the top of the case. A lock screw 29 fitted into the orifice bears upon the top of the screw-shank.

It will be seen that the two members of the metal support can be readily adjusted to vary the spaced relation of the bodies 20, 2l to each other in accordance with the depth of the valve chamber, and that when the valve element is introduced in the chamber the screw-shank can be vertically adjusted to effect a predetermined pressure of the lower or closing body upon the valve seat at the bottom of the case. Also that the valve element when it is positioned within the case will be firmly held upon the seat under varying conditions of service; that is, the valve will be effectually seated not only when the flow of air thereto is turned off, but when the valve is subjected to severe vibrations, or is set at various angles. It will also be seen that the novel valve element can be mounted with either end body thereof imposed on the seat 24, and that the parts of the device are readily removable and replaceable, as necessity may require.

I preferably provide the body l0 with a tapering dovetail projection 30 adapted to be seated and Vheld in a 'correspondingly formed socket 3l in a bracket bar 32 bolted to the side of the car, &c., tofwhich the retaining Lvalve device is applied.

In Fig. i of the drawings I have illustrated a modified form vof valve element wherein the support comprises a single hollow cylinder 16 having therein elastic bodies 20, 21 with rounded outer ends which project beyond the respective ends of the cylinder.

It is to be understood that I do not limit my invention to the kdetails of construction herein disclosed, as the parts may be modified within the principle of the invention and the scope of the appended claims.

I claim:

l. The combination with a valve casing having a port at one end thereof, of a valve element comprising a support movabl y contained in said casing, an elastic body carried by and projecting from said support, the projecting portion of the body being convex and being adapted to be seated on the port, and adjustable pressure means acting upon the valve element to maintain the said body normally seated on the port.

2. The combination with a valve casing having a port at one end thereof, of a valve element comprising a support movably contained in said casing and two oppositely disposed elastic bodies carried by said support, one of' said bodies having a projecting convex surface adapted to be seated on the port, and a pressure member adjustably mounted in the end of the casing remote from the port and adapted to bear upon the other elastic body.

3. The combination with a valve casing having at one end thereof a port and at the other end a bearing surface, of a valve element comprisinga cylindrical support,

elastic bodies having convex surfaces proelement comprising a cylindrical support, i

and convex bodies carried by and projecting from the ends of said support, Vone of said bodies being imposed upon the valve seat and the other bearing against the head.

5. The combination with a valve' casing having at one end a port with a valve seat, a bearing head at the opposite end of the casing, and means whereby said head can be adjustedy toward and from the valve seat, of a valve element comprising Vtwo as'- sociated supporting parts, means whereby said parts can be adjusted toward and from each other, bodies secured to the respective supporting parts and having convex outer ends arranged to press in opposition to each other against the valve seat and the upper bearing surface.

6. In a pressure retaining valve, aivalve element comprising two associated supporting parts, means whereby said parts can be adjusted toward kand from each other, a closure member on one of. said parts, and a cushioning member on the other part. Y

7. In a pressure retaining valve7 a valve element comprising two associated supporting parts, means whereby said parts can be adjusted toward and from each other, and bodies of elastic substance having conveX surfaces projecting beyond the outer ends of said supporting parts.

8. In a pressure retaining valve, a valve element comprising two supporting parts having a male and female screw connection, means for securing said parts inpositions of relative adjustment, and bodies of elastic substance detachably secured to the respective supporting parts, and :having convex surfaces projecting beyond Vthe respective outer ends of s'aid'parts..V

9. In a pressure retaining valve, a valve element comprising two supporting parts, means whereby said parts can be adjusted toward and from each other, and planoconvex bodies of elastic substance on the outer surfaces of the respective supporting parts, said bodies and surfaces having interlocking dove-tail connections.

l0. In a pressure retaining valve, a valve element comprising two supporting parts having a male and female screw connection, means for securing said parts in positions of adjustment, plano-convex bodies of 10 elastic substance on the outer surfaces of the respective supporting parts, said bodies and surfaces having interlocking, dove-tail connections.

Signed at Test Pittston, in the county 15 of Luzerne and State of Pennsylvania this 28th day of February A. D. 1922.

EDDY L. CLARK. 

